add auth middleware

src/MiddleWare/AuthMiddleware.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace DigiWill\MiddleWare;
+
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface as Handler;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Psr\Http\Message\ResponseInterface as Response;
+use Slim\Psr7\Response as SlimResponse;
+
+class AuthMiddleware implements MiddlewareInterface
+{
+    public function process(Request $request, Handler $handler): Response
+    {
+        if (isset($_SESSION['user_id'])) {
+            return $handler->handle($request);
+        }
+
+        $uri = $request->getUri()->getPath();
+        if ($uri !== '/login' && $uri !== '/logout') {
+            $_SESSION['intended'] = $uri;
+        }
+        $resp = new SlimResponse(302);
+
+        return $resp->withHeader('Location', '/login');
+    }
+}